(Postfix notation) Postfix notation is a way of writing expressions without using parentheses. For example, the expression (1 + 2) 3 would be writ- ten as 1 2 + 3 *. A postfix expression is evaluated using a stack. Scan a postfix expression from left to right. A variable or constant is pushed to the stack. When an operator is encountered, apply the operator with the top two operands in the stack and replace the two operands with the result. The follow- ing diagram shows how to evaluate 1 2 + 3 *. 1. 3 3 9. 12 + 3 * 12 + 3* 12+3* 12 + 3* 12 +3* scanned scanned scanned scanned scanned Write a program that prompts the user to enter a postfix expression and evalu- ates it.

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